Improving county access to high-resolution imagery

作者：琳达·达菲（Linda Duffy）

作为订阅者HXGN内容程序通过华盛顿州，农村Jefferson County在美国，从可用的最新高分辨率航空影像中受益。非常有用的决策支持工具是通过用详细的县范围内的GIS数据覆盖图像来创建的。通过组合信息获得的见解导致更有信息的分析，更快的批准流程以及为内部和外部客户提供更好的服务。

Unique county characteristics

Jefferson County encompasses a diverse geographic area, which presents special challenges for government administrators. Located on the Olympic Peninsula, the coastline along the Pacific Ocean forms the western border of the county, while the eastern section includes four small towns, a shipping port, several islands, farmland and an active naval facility. In between West Jefferson County and East Jefferson County lies Olympic National Park and Olympic National Forest, managed by the federal government. In total, about 31,000 residents are dispersed over 5,654 square kilometres.

由于地形各不相同，而且从东部汤森港（Port Townsend）的县城到西部的太平洋海岸，现场检查可能会很耗时且昂贵，从而导致建筑许可证批准，基础设施计划和环境保护工作延迟。政府和私人用户都受益最新的航空影像because it provides感兴趣领域及其周围的详细信息和减少了对面对面访问的需求。

“借助空中图像，我们可以看到结构，附属建筑和自然特征，当与轮廓结合使用时，我们可以从办公室做出很多决定，”Jefferson County Central Services的GIS分析师/制图师Kevin Hitchcock说。“In a rural community like ours, online maps are used for a variety of activities, such as planning new developments and evaluating impacts on streams and wetlands. The Public Lands Records database also includes sales history and other information for every property in the county, making it easy to do research without leaving the office.”

Improved basemap

In 2015, counties and municipalities throughout the State of Washington were approached to assess their interest incost-sharing to obtain high-resolution aerial imagery整个州。必须从当地司法管辖区的一定程度的参与才能使其具有成本效益。在杰斐逊县，部门经理和行政人员一致认为，签约将是有益的。最终，该县签订了为期三年的合同通过HXGN内容程序接收图像。

HXGN内容计划收集了美国，欧洲部分地区和加拿大人口稠密地区的投机现成的矫正图像，以创建可供客户使用的数据库。目标是获取cloud-free 30-centimetre resolution, 4-band imagery over less populated areas, and 15-cm resolution over metro areas with a population greater than 50,000. In 2017, Jefferson County received30-cm resolution aerial imagery，对2011年通过国家农业图像计划（NAIP）获得的1米基台的欢迎更新。

Jefferson County Central Services GIS团队的目标是开发和维护有效的全县资源，以满足政府机构和公众的需求。历史和当前的图像和GIS数据层可通过ESRI ArcGIS Web应用程序查看和打印。由托管的图像地图服务Valtus，六边形的一部分，允bob体育报道许用户将内容作为图层添加到任何GIS Webmap。公众可以下载现有的ShapeFiles，例如税收包裹，但不能下载实际图像。政府雇员有权下载图像以创建衍生产品并进行分析。bob综合app下载

对社区的好处

杰斐逊县创造了一个user-friendly GIS其中包含广泛的信息。在线地图档案包括rich data layers such as zoning, fire districts, school districts, roads, emergency services, and channel migration zones overlaid on the high-resolution imagery。

在县内，空间和地图信息的经常用户包括环境卫生部门，公共工程，社区发展和评估员。紧急响应者（例如警察和消防员）得到了地址点层的帮助，以查明最快的方式来吸引有需要的人，而私营部门的工程师可以更轻松地设计化粪池系统analysing online data。For shoreline properties, developers check for extra regulatory restrictions to ensure compliance with proximity to shoreline and erosion concerns.

“通过HXGN内容程序访问高分辨率的航空影像，使您可以更轻松地在周围地形的详细和更广泛的背景下可视化感兴趣的领域，”says Hitchcock.“We save time and money by completing our work with online tools. As we continue to explore the applications, there will probably be a desire for even higher resolution to support better decision making.”